There is no negative amount of change in mechanical energy

The landlord's question is:

There is no negative amount of change in mechanical energy

Answer: 1. Since it is the amount of change, the change of , of course, there are positive and negative;

2. Of course, there are also people like the netizens upstairs who regard the amount of change as an absolute value, the reason is that there is a serious phenomenon of big grin in our teaching, at least more than 95% of teachers are big grinning habits, and over time.

Over time, a bad habit similar to the ruffian culture has been formed. For example, a, uniform motion, is it uniform velocity? Or is it a uniform rate?

In linear motion it refers to uniform velocity, but in circular motion it refers to uniform velocity;

b. Velocity v = ds dt, is s the distance, or the displacement, or the position?

c. Resistor, is it a resistor? Resistive? Resistance value? Resistivity?

d. Capacitor, is it a capacitor? Capacitive? Capacitance value? Permittivity?

3. There is no kind of energy called mechanical energy.

It refers to kinetic energy, which is the sum of potential energy.

And this kinetic energy includes both translational kinetic energy and rotational kinetic energy.

The potential energy includes gravitational potential energy, elastic potential energy, and electrostatic potential energy.

4. When the sum of these energies changes, we denote it by e.

Usually "increase" means "increment", the concept of increment.

The increase in increment is not necessarily positive, it just means that the amount of the back minus the amount of the front can naturally be positive or negative.

5. The landlord still needs to be very careful, in normal times, Chinese likes to omit and like.

Speaking a four-word idiom, even if the meaning is unclear, we do not hesitate to do so. Study on a daily basis.

When taking the exam, you should pay special attention to comprehending the substantive meaning, and not be embarrassed.

Textbooks, bluffing teachers are stunned.

There is no amount of change, only positive, which makes sense.

Look directly at the definition: that is, look at the kinetic control energy and gravitational potential energy.

How the elastic potential energy changes determines that the mechanical demolition brigade fails.

changes; The angle of work done: the algebraic sum of the work done by forces other than the heavy brigade force and the spring elastic force is equal to the change in the mechanical energy of the object (or system).

Perspective of energy conversion: Look at the transformation between mechanical energy and other energy.

1. Mechanical energy is indeed the sum of potential energy and kinetic energy. However, a, potential energy includes gravitational potential energy, static and filial piety loss potential energy, and elastic potential energy;

b. Kinetic energy includes translational kinetic energy, rotational kinetic energy, precession kinetic energy, vibration kinetic energy, and the mass of the object is m The vertical bucket slowly rises from rest with g 2 acceleration, how does the mechanical energy of the object change?

Without considering friction, even if it can be constant, that is, mechanical energy is conserved.

3. The amount of change in mechanical energy = the amount of change in kinetic energy + the change in gravitational potential energy. Nothing wrong, it's true.